Docker 初步体验
一、初步使用
终端中输入docker，打印出docker的命令列表：
Commands:
attach Attach to a running container
build Build an image from a Dockerfile
commit Create a new image from a container's changes
cp Copy files/folders from a container's filesystem to the host path
create Create a new container
diff Inspect changes on a container's filesystem
events Get real time events from the server
exec Run a command in a running container
export Stream the contents of a container as a tar archive
history Show the history of an image
images List images
import Create a new filesystem image from the contents of a tarball
info Display system-wide information
inspect Return low-level information on a container
kill Kill a running container
load Load an image from a tar archive
login Register or log in to a Docker registry server
logout Log out from a Docker registry server
logs Fetch the logs of a container
port Lookup the public-facing port that is NAT-ed to PRIVATE_PORT
pause Pause all processes within a container
ps List containers
pull Pull an image or a repository from a Docker registry server
push Push an image or a repository to a Docker registry server
restart Restart a running container
rm Remove one or more containers
rmi Remove one or more images
run Run a command in a new container
save Save an image to a tar archive
search Search for an image on the Docker Hub
start Start a stopped container
stop Stop a running container
tag Tag an image into a repository
top Lookup the running processes of a container
unpause Unpause a paused container
version Show the Docker version information
wait Block until a container stops, then print its exit code
接下来就可以尝试使用这些命令了，不过在进行下一步之前，我们要先了解几个概念。
二、重要概念
1.image 镜像
镜像就是一个只读的模板。比如，一个镜像可以包含一个完整的Ubuntu系统，并且安装了apache。
镜像可以用来创建Docker容器。
其他人制作好镜像，我们可以拿过来轻松的使用。这就是吸引我的特性。
2.Docker container 容器
Docker用容器来运行应用。容器是从镜像创建出来的实例（好有面向对象的感觉，类和对象），它可以被启动、开始、停止和删除。
3.仓库
这个好理解了，就是放镜像的文件的场所。比如最大的公开仓库是Docker Hub。
三、几个简单的实践
1.search
搜索仓库中是否有wordpress这个博客镜像，如下：
$ docker search wordpress
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
wordpress The WordPress rich content management syst... 185 [OK] 2.下载这个镜像
$ docker pull wordpress
wordpress:latest: The image you are pulling has been verified 3.查看自己的镜像
$ docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
linc-wiki latest b5a1e34b01c2 27 hours ago 689.7 MB
ubuntu latest 5ba9dab47459 5 days ago 188.3 MB
wordpress latest ecc04d6d638c 6 days ago 470 MB 4.简单的运行
运行wordpress要进行mysql的配置，为了演示run，将ubuntu跑起来吧。
$ docker run -it ubuntu /bin/bash
root@46ff2a695ce1:/# echo "I am linc"
I am linc 至此，体验结束。后续会有更加精彩的实践等着我们，Docker，我们来了！
参考：
https://docs.docker.com/installation/ubuntulinux/
https://bitnami.com/stack/mediawiki
https://docs.docker.com/userguide/
https://dockerpool.com/static/books/docker_practice
http://zhumeng8337797.blog.163.com/blog/static/1007689142014524115743806/